Connecting brass P-trap to ABS drain, without slip joint

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by RuralAtlantic, May 18, 2021.

  1. RuralAtlantic

    RuralAtlantic New Member

    Joined:
    May 18, 2021
    Location:
    East Coast Canada
    I'm trying to connect a 1-1/4" brass p-trap (for an exposed vanity) to the 1-1/2" ABS drain line. The challenge is that the wall that the drain is in is very shallow (about 2.5") and the pipe escutcheon/flange is not deep enough to cover an entire slip join, it is just deep enough to cover the exposed sanitary T join (see my 2nd pic). We are putting up 3/8" thick beadboard instead of drywall, so that won't add much more depth to work with.

    In my ideal situation, I would replace the 1-1/2" sanitary T with one that reduces to 1-1/4" for the p-trap, then connect them with some sort of sealant, but I don't know, is there's anything that works with brass and ABS?

    The top of this T goes to the vent for this sink.

    PXL_20210518_234228060.jpg

    Showing how little clearance there is. Here the escutcheon is flush against the ABS, and it's just in-line with the studs, meaning the beadboard would add 3/8" clearance.

    PXL_20210518_234247936.jpg
     
  2. plumber69

    plumber69 In the Trades

    Joined:
    Jun 20, 2014
    Location:
    Prince Rupert, British Columbia
    This should work

    Screenshot_20210518-173051_Chrome.jpg
     
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  4. RuralAtlantic

    RuralAtlantic New Member

    Joined:
    May 18, 2021
    Location:
    East Coast Canada
    Right, I know I could fall back to using a slip join and try to make sure it gets covered up nicely if the escutcheon is not deep enough, but I'm wondering if there's any sort of sealant product that would work for brass and ABS?
     
  5. wwhitney

    wwhitney Well-Known Member

    Joined:
    Mar 17, 2019
    Location:
    Berkeley, CA
    No, no sealant option. The part plumber69 mentioned (spigot trap adapter, spigot x SJ) is your lowest profile option. You can get a brass box escutcheon if necessary.

    Cheers, Wayne
     
    Last edited: May 19, 2021
  6. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
  7. RuralAtlantic

    RuralAtlantic New Member

    Joined:
    May 18, 2021
    Location:
    East Coast Canada
    Okay, thanks for the guidance everyone!
     
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